Crownless Reincarnation: New World? Nah I'd win - Chapter 20: Cradle of Regret.

After the brutal loss of his beloved grandfather, Liam Hunter embarks on a harrowing journey into the heart of the Dark Forest, known as the Forest of Kyrell, with a singular goal: to gain the strength necessary to honor his grandfather’s memory and to never lose anyone dear to him again. At just ten years old, Liam is thrust into a world of darkness and malevolence, where he endures four grueling years of training and transformation. In this shadowy realm, he is reborn as a fierce warrior, driven by a relentless desire to eradicate every demon and ultimately confront the Demon King, Emrys himself. To achieve his formidable goal, Liam must forsake any emotional connections that could weaken his resolve. The once vibrant and joyful boy is transformed by his trials into a cold and unfeeling combatant, hardened by the harsh realities of his quest. This is the story of Liam Hunter—the last wielder of dark magic—whose journey through darkness and sacrifice will shape him into a force of vengeance and resolve.

Bai Yang is the youngest son of a rich family, he grew up spoiled and unambitious, and no one expects anything from him. He doesn’t really mind this though, because he’s still able to live a simple and happy life.

One day, however, his older brother got into an accident and is now comatose. Bai Yang’s father now has to consider his youngest son to take over the family business. Unfortunately, for him, Bai Yang is a weak, timid, and cowardly child. How can he ever succeed?!

Wanting to change his son’s personality, his father has Bai Yang transmigrated into the world of Wild Wind, a very famous fantasy novel. Bai Yang’s father hopes the environment of that world will shape his son into a more arrogant and domineering man, as a child of a wealthy family ought to be.

However, due to an error in the Main System, instead of transmigrating as the protagonist, Bai Yang ends up becoming a cannon fodder villain, Xie Zietian, from the Demon Realm! In order to safely and quickly return to his world, Bai Yang has to ensure that the protagonist, Zhou Ying, ascends to the heavens so his transmigration mission will be completed.

In order to sneak into the Human Realm and help Zhou Ying, Bai Yang comes up with a variety of excuses to the Demon King of Everlasting Night, such as…

Bai Yang said in a dignified manner, “Your Majesty, that person might threaten the demon world. I will go to the human world to kill him for you!” (Actually, I went there to meet the protagonist.)

Bai Yang proclaimed his loyalty to the Demon King, “Your Majesty, hang in there. I will go to the human world to find the elixir for you!” (Actually, I went there to save the protagonist.)

Bai Yang said with an attitude of selfless dedication, “Your Majesty, I just want to go to the human world to further your great cause!” (Actually, I went there to see the protagonist.)

The Demon King’s face remained impassive but, in fact, the tips of his ears were red. He was thinking: I can’t believe he loves me so deeply…

Demon King said, “Humph! Seeing how clingy you are, I’ll accept your love. Tell me! Whatever you need, I’ll give it to you!”

Bai Yang: “What the hell…! Your Majesty, I don’t love you.”

Demon King said, “No, you love me.”

The Demon King truly believed Bai Yang and him shared a deep mutual love until he discovered that Bai Yang was having an “affair” with a “wild human” …

- Description from Novelupdates

I intervene in all events of the game. And take it away.

An alien race invaded the Earth on June 6, 2128. At the midst of this war, many nations allied with the alien threat and the war nearly wiped out the rebelling humans of the planet. At the edge of mankind's survival, the United Nations Army launched its forces to eliminate the immediate stellar threats that loomed over Earth.

General Seeker Carlean, commander and leader of the mission, risked and gave his life to destroy the immediate stellar threat. The battle was won though Earth lay in ruins. Perhaps mankind will live to see a few years of peace before the alien threat returns to wipe out their existence.

At the immediate aftermath of the stellar battle, the fallen Seeker Carlean awakens and finds himself at aged 17, living the peaceful life he lived 16 years before he died.

So begins a new game in the battle for humanity's survival.